Brick must be clean, sound and able to absorb water. Dirt, moss and loose material are washed off, and the wall is checked for efflorescence, the white salt bloom that signals moisture moving through the wall. A simple water test shows whether an old water-repellent sealer will stop the limewash from soaking in.
Cracked mortar, failed caulking, leaking gutters or soil piled against the wall are fixed or flagged first. Limewash is breathable and lets moisture out, but it does not cure the cause of a wet wall. On homes built before 1978, scraping or stripping old paint has to follow lead-safe work practices by a firm certified under Washington’s renovation rules.